81 x 9 = 801. What must you do to make the this equation true?

Can you solve below mathematical equation?

2^1234 - 2^1233

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

Why blonde cannot dial 911?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Find the missing number in the sequence below:

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?